Question: What is the NFPA instability rating for carbon dioxide?
Paraphrase: Which is the instability rating of NFPA for carbon dioxide?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q1997 p:P4952 ?s . ?s ps:P4952 ?obj . ?s pq:P995 ?x filter(contains(?x , '0')) }